CN203696560U - Backlash Elimination Structure of Gear Transmission Mechanism - Google Patents

Abstract

The utility model discloses a structure for eliminating backlash of a gear transmission mechanism, which comprises two output shafts, namely a first output gear shaft provided with a first driven helical gear and a second output gear shaft provided with a second driven helical gear; output gears on the first output gear shaft and the second output gear shaft are meshed with the large gear ring; two driving bevel gears with opposite spiral directions are arranged on the central shaft; the first driven bevel gear and the second driven bevel gear are respectively meshed with the two driving bevel gears; an axial position adjusting structure is arranged on the central shaft. By adopting the technical scheme, the large gear ring is driven by the two small transmission gears, the clearance is eliminated in a pre-feeding mode, and the lateral clearance of the gears is eliminated by a staggered mode of the double-piece gears, so that the operation and the speed regulation are convenient; the gear clearance can be effectively eliminated, and the rotation positioning precision and the repeated positioning precision of the gear machine tool are improved, so that the machining precision of the machine tool is improved.

Description

Backlash Elimination Structure of Gear Transmission Mechanism

technical field

The utility model belongs to the technical field of mechanical processing machine tools, and relates to a transmission mechanism of a numerically controlled heavy-duty machine tool. More specifically, the utility model relates to a tooth side clearance elimination structure of a gear transmission mechanism. the

Background technique

The rotary table of the CNC heavy-duty machine tool adopts the gear and ring gear transmission mechanism. That is, the large ring gear is set on the workbench of the machine tool, and the driving gear on the output shaft of the reduction mechanism meshes with the large ring gear. When working, the large ring gear is driven by the driving gear, so as to realize the rotary motion of the worktable for cutting. the

However, the error generated during the processing of the gear and the friction during the operation will increase the backlash of the gear, which will affect the rotation accuracy and repeat positioning accuracy of the machine tool, thereby affecting the machining accuracy of the machine tool. the

Utility model content

The utility model provides a tooth side gap elimination structure of a gear transmission mechanism, the purpose of which is to eliminate the gear gap and improve the rotary positioning accuracy and repeat positioning accuracy of a gear machine tool. the

In order to achieve the above object, the technical scheme that the utility model takes is:

The tooth side gap elimination structure of the gear transmission mechanism of the utility model is applied to a multi-stage gear transmission mechanism, including an input shaft gear, an output shaft and a central shaft; the multi-stage gear transmission mechanism drives the large ring gear of the working mechanism, so The output shaft described is two pieces, which are respectively the first output gear shaft provided with the first driven helical gear and the second output gear shaft provided with the second driven helical gear; the first output gear shaft, the second The output gears on the output gear shaft are all meshed with the large ring gear; the central shaft is provided with two driving helical gears with opposite helical directions; the first driven helical gear and the second driven helical gear are respectively connected to the Two driving helical gears mesh; the central shaft is provided with an axial position adjustment structure. the

The axial position adjustment structure is provided with a disc spring, a cylindrical radial roller bearing and an adjusting nut. The disc spring is sleeved on the end of the central shaft, and one end of the cylindrical radial roller bearing end, and the other end is compressed by the adjusting nut. the

The input shaft gear meshes with the double-piece gear on the II shaft; the shaft gear on the II shaft meshes with the double-piece gear on the III shaft; the shaft gear on the III shaft meshes with the double-piece gear on the central shaft The gears mesh; the double-plate gear includes two coaxial gear plates with the same number of teeth and modules, which are connected by fastening bolts; the double-plate gear is provided with a gap elimination mechanism. the

The clearance elimination mechanism is that a gear in the double gear is provided with a tangential groove, and a cylindrical pin fastened to it is provided on the other gear and extends into the tangential groove; a tangential groove is provided in the tangential groove. A compression spring arranged in the direction, one end of the compression spring bears against the end of the tangential groove through a steel ball, and the other end bears against the cylindrical pin. the

The fastening bolts are connected to one gear in the double gear through a helical structure; the connecting holes of the fastening bolts on the other gear are waist-shaped holes distributed tangentially. the

The utility model adopts the above-mentioned technical scheme, drives the large ring gear through two small transmission gears, and pre-adds the way to eliminate the gap, and at the same time uses the double-plate gear to dislocate the way to eliminate the lateral gap of the gears, and the operation is convenient. ; It can effectively eliminate the gear gap, improve the rotary positioning accuracy and repeat positioning accuracy of the gear machine tool, thereby improving the machining accuracy of the machine tool. the

Description of drawings

The following is a brief description of the contents expressed in the drawings of this manual and the marks in the drawings:

Fig. 1 is the expanded schematic diagram of transmission system of the present utility model;

Fig. 2 is the end face schematic diagram of transmission mechanism of the present utility model;

Fig. 3 is the structural schematic diagram of double-plate gear eliminating backlash;

Fig. 4 is a detailed structural diagram of the axial position adjustment structure of the central shaft. the

Marked in the figure as:

1. Input shaft gear, 2. Double-plate gear, 3. II shaft, 4. Double-plate gear, 5. III shaft, 6. Drive helical gear, 7. Cylindrical radial roller bearing, 8. Disc spring, 9 , Central shaft (IV axis), 10, the first output gear shaft (VI axis), 11, the first driven helical gear, 12, the second output gear shaft (V axis), 13, the second driven helical gear, 14, ring gear, 15, fastening bolt, 16, steel ball, 17, compression spring, 18, cylindrical pin, 19, adjusting nut. the

Detailed ways

Next, with reference to the accompanying drawings, through the description of the embodiments, the specific implementation of the utility model will be further described in detail, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the utility model . the

The structure of the present utility model as shown in Figure 1 is a tooth side clearance elimination structure of a gear transmission mechanism, which is applied to a multi-stage gear transmission mechanism for driving a numerically controlled heavy-duty rotary table, including an input shaft (I shaft), an input shaft Gear 1, output shafts (VI shaft, V shaft) and central shaft 9 (IV shaft); the multi-stage gear transmission mechanism drives the large ring gear 14 of the working mechanism. When the table of the machine tool is rotating (B axis), it adopts a gear ring gear transmission mechanism. the

In order to solve the problems existing in the prior art and overcome its defects, realize the purpose of eliminating the gear gap, improve the rotary positioning accuracy and repeat positioning accuracy of the gear machine tool, the technical solution adopted by the utility model is:

As shown in Fig. 1 to Fig. 4, the tooth side clearance elimination structure of the gear transmission mechanism of the present invention has two output shafts, which are respectively the first output gear shaft 10 with the first driven helical gear 11, The second output gear shaft 12 provided with the second driven helical gear 13; the output gears on the first output gear shaft 10 and the second output gear shaft 12 are all meshed with the large ring gear 14; the central shaft 9 is provided with two driving helical gears 6 with opposite helical directions; the first driven helical gear 11 and the second driven helical gear 13 mesh with the two driving helical gears 6 respectively; Axial position adjustment structure. the

The servo motor drives the input shaft gear 1, and the input shaft gear 1 meshes with the double-plate gear 2. Through three pairs of gear pairs (each pair of gears includes a double-plate gear, that is, the double-plate gear 2 and the double-plate gear 4), the gap elimination mechanism Eliminate the tooth side clearance of the gear (spring backlash), and transmit the motion to the central shaft 9. The two helical gears on the central shaft 9 (IV axis), that is, the two driving helical gears 6 in the figure, are respectively connected to the first slave The driven helical gear 11 and the second driven helical gear 13 mesh to drive the first output gear shaft 10 and the second output gear shaft 12 . the

In order to improve the positioning accuracy and repeat positioning accuracy of the table rotation, a preloaded double pinion anti-backlash device and a double-plate gear anti-backlash device are used, as shown in Figure 1. Two output pinions, i.e. the output gears on the first output gear shaft 10 and the second output gear shaft 12, i.e. the first driven helical gear 11, the second driven helical gear 13 and the two sides of the toothed ring gear 14 respectively. The outer sides are engaged at the same time, driving the table to perform rotary motion. The transmission position relationship is shown in Figure 1 and Figure 2. the

The axial position adjustment structure is shown in Figure 4:

The axial position adjustment structure is provided with a disc spring 8, a cylindrical radial roller bearing 7 and an adjusting nut 19. The disc spring 8 is sleeved on the end of the central shaft 9, and one end is pushed against the cylindrical direction. The end of the inner roller bearing 7, the other end is compressed 19 by the adjusting nut. the

The above-mentioned axial position adjustment structure adjusts the axial position of the central shaft 9 (IV axis), and eliminates the backlash between the two output pinions and the large ring gear 14 . Its adjustment method is:

As shown in Figure 4, the first output gear shaft 10 (VI axis) is loosened, the second output gear shaft 12 (V axis) is tightened, and the first output gear shaft 10 (VI axis) is lowered to the meshing gap At the maximum position, pull the III shaft 5 clockwise and do not move, so that the tooth surface of the output gear on the second output gear shaft 12 (V shaft) meshes with the tooth surface of the large ring gear 14, and the backlash on the right tooth side is eliminated, as shown in Figure 2 at the same time, rotate the first driven helical gear 11 clockwise to eliminate the gap between the helical gear and the central shaft 9, and turn the second output gear shaft 12 (V axis) counterclockwise to make the second output gear The output gear tooth surface of shaft 12 (V axis) meshes with the other tooth surface of large ring gear 14, eliminates the gap on the left side, and tightens the tension sleeve screw in the first driven helical gear 11. the

The settings for the double-plate gear are:

As shown in Figures 1 and 2, the input shaft gear 1 meshes with the double-plate gear 2 on the II shaft 3; the shaft gear on the II shaft 3 meshes with the double-plate gear 4 on the III shaft 5; The shaft gear on the III shaft 5 meshes with the double-plate gear on the central shaft 9; the double-plate gear includes two coaxial gear plates with the same number of teeth and modules, which are connected by fastening bolts 15; The double-plate gear is equipped with a backlash elimination mechanism. the

As shown in Figure 3, the gap elimination mechanism is:

The described gap elimination mechanism is that a gear in the two-piece gear is provided with a tangential groove, and the other gear is provided with a cylindrical pin 18 tightly connected with it and extends into the tangential groove; Tangentially arranged compression spring 17, one end of the compression spring 17 withstands the end of the tangential groove through the steel ball 16, and the other end withstands the cylindrical pin 18. the

The fastening bolt 15 is connected to one gear in the double-plate gear through a helical structure; the connecting hole of the fastening bolt 15 on the other gear is a waist-shaped hole distributed tangentially. the

As shown in Figure 3, the double-plate gear anti-backlash adjustment method:

Loosen the fastening bolt 15, and through the action of the compression spring 17 in the double-plate gear, the upper and lower gears of the double-plate gear will be misaligned in the direction of rotation, and the two sides of the two gears will be at the same time as the two sides of the meshing gear. Engage, eliminate the gap before the central shaft 9, and then tighten the fastening bolt 15. the

The utility model has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited by the above-mentioned methods, as long as various insubstantial improvements are made by adopting the method concept and technical solutions of the utility model, or Directly applying the ideas and technical solutions of the utility model to other occasions without improvement is within the protection scope of the utility model. the

Claims (5)

1. the elimination backlash structure of gear drive, is applied to multilevel gear drive mechanism, comprises input shaft gear (1), output shaft and central shaft (9); Described multilevel gear drive mechanism drives the bull gear (14) of operating mechanism, it is characterized in that: described output shaft is two, be respectively be provided with the first driven helical gear (11) the first output gear shaft (10), be provided with second output gear shaft (12) of the second driven helical gear (13); Output gear on described the first output gear shaft (10), the second output gear shaft (12) all engages with described bull gear (14); Described central shaft (9) is provided with two active oblique gears (6) that the hand of spiral is contrary; Described the first driven helical gear (11), the second driven helical gear (13) engage with two active oblique gears (6) respectively; Described central shaft (9) is provided with axial location adjustment structure.

2. according to the elimination backlash structure of gear drive claimed in claim 1, it is characterized in that: described axial location adjustment structure is provided with disk spring (8), cylinder radial roller bearing (7) and adjusting nut (19), described disk spring (8) is enclosed within the end of central shaft (9), one end withstands on the end of described cylinder radial roller bearing (7), and the other end is compressed by described adjusting nut (19).

3. according to the elimination backlash structure of gear drive claimed in claim 1, it is characterized in that: described input shaft gear (1) engages with the split gear (2) on II axle (3); Shaft gear on described II axle (3) engages with the split gear (4) on III axle (5); Shaft gear on described III axle (5) engages with the split gear on central shaft (9); Described split gear comprises two coaxial and numbers of teeth, the gear sheet that modulus is equal, connects by fastening bolt (15); Described split gear is provided with elimination clearance mechanism.

4. according to the elimination backlash structure of gear drive claimed in claim 3, it is characterized in that: described elimination clearance mechanism is to be provided with tangential slot on the plate gear in split gear, on another plate gear, establish the straight pin (18) being fastenedly connected with it and stretch in tangential slot; In tangential slot, establish the Compress Spring (17) of arranged tangential, the end that tangential slot is withstood by steel ball (16) in described Compress Spring (17) one end, the other end withstands described straight pin (18).

5. according to the elimination backlash structure of gear drive claimed in claim 3, it is characterized in that: described fastening bolt (15) is connected with the plate gear in split gear by helical structure; The mounting hole that the connecting hole of the fastening bolt (15) on another plate gear is tangential distribution.